镁钼氧化物催化剂制备多壁纳米碳管的初步研究

采用溶胶-凝胶法合成了可用来催化裂解甲烷大量制备高质量和较高纯度的多壁纳米碳管的镁钼氧化物催化剂. 实验表明该催化剂具有较高的活性和催化效率, 反应2h后, 制备的多壁纳米碳管的量接近原始催化剂量的30倍. 并用透射电镜、高分辨透射电镜、激光拉曼和热重分析对制得的粗产品进行了表征, 结果表明: 碳管的直径在10～22nm之间, 且随着反应时间的延长, 制备的纳米碳管石墨化程度增加, 反应1h后, 粗产品中碳管含量达95%, 同时, 对催化剂的特殊催化生长机理作了讨论, 生长过程中多层Mo颗粒析出在MgO载体表面是碳管成束的主要原因.

Magnesium and Molybdenum Oxide for Bundled Multi-walled Carbon Nanotubes Synthesis

Magnesium and molybdenum oxide prepared by a sol-gel method was used to synthesize high quality multi-walled carbon nanotubes bundles by catalytic decomposition CH4. The . experiment reveals that the prepared catalysts have high activity and high efficiency. After reacting for 2h, the quantity of synthesized MWNTs is over 30 times of the pristine catalysts. Transmission electron microscopy, high-resolution transmission electron microscopy, thermal gravimetric analysis and laser Raman spectroscopy were used to characterize the synthesized MWNTs bundles. The results show that the synthesized MWNTs bundles have a diameter distribution about 10-22nm. The longer the reaction time, the graphitization degree of the synthesized MWNTs bundles. After reacting for 1h, the MWNTs bundles with a high purity of more than 95% can be obtained. The forming multilayers Mo particles on the surface of MgO support are the main cause of the nanotubes bundles growth.